Abstract:
Using computations of three-dimensional magnetohydrodynamic (MHD) turbulence with a Taylor-Green flow, whose inherent time-independent symmetries are implemented numerically, and in the absence of either a forcing function or an imposed uniform magnetic field, we show that three different inertial ranges for the energy spectrum may emerge for three different initial magnetic fields, the selecting parameter being the ratio of nonlinear eddy to Alfvén time. Equivalent computational grids range from 1283 to 20483 points with a unit magnetic Prandtl number and a Taylor Reynolds number of up to 1500 at the peak of dissipation. We also show a convergence of our results with Reynolds number. Our study is consistent with previous findings of a variety of energy spectra in MHD turbulence by studies performed in the presence of both a forcing term with a given correlation time and a strong, uniform magnetic field. However, in contrast to the previous studies, here the ratio of characteristic time scales can only be ascribed to the intrinsic nonlinear dynamics of the paradigmatic flows under study. © 2010 The American Physical Society.
Registro:
Documento: |
Artículo
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Título: | Lack of universality in decaying magnetohydrodynamic turbulence |
Autor: | Lee, E.; Brachet, M.E.; Pouquet, A.; Mininni, P.D.; Rosenberg, D. |
Filiación: | Geophysical Turbulence Program, National Center for Atmospheric Research, P.O. Box 3000, Boulder, CO 80307-3000, United States Centrum voor Plasma-Astrofysica, Departement Wiskunde, Katholieke Universiteit Leuven, Celestijnenlaan 200B, B-3001 Leuven, Belgium Icole Normale Supérieure, 24 Rue Lhomond, 75005 Paris, France Departamento de Física, Facultad de Ciencias Exactas y Naturales, Ciudad Universitaria, 1428 Buenos Aires, Argentina
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Palabras clave: | Characteristic time; Computational grids; Correlation time; Energy spectra; Forcing function; Forcing terms; Magnetic Prandtl numbers; Magnetohydrodynamic turbulence; MHD turbulence; Non-linear dynamics; Taylor-Green flow; Taylor-Reynolds number; Magnetic fields; Reynolds number; Spectroscopy; Turbulence; Magnetohydrodynamics |
Año: | 2010
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Volumen: | 81
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Número: | 1
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DOI: |
http://dx.doi.org/10.1103/PhysRevE.81.016318 |
Título revista: | Physical Review E - Statistical, Nonlinear, and Soft Matter Physics
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Título revista abreviado: | Phys. Rev. E Stat. Nonlinear Soft Matter Phys.
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ISSN: | 15393755
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CODEN: | PLEEE
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Registro: | https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_15393755_v81_n1_p_Lee |
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Citas:
---------- APA ----------
Lee, E., Brachet, M.E., Pouquet, A., Mininni, P.D. & Rosenberg, D.
(2010)
. Lack of universality in decaying magnetohydrodynamic turbulence. Physical Review E - Statistical, Nonlinear, and Soft Matter Physics, 81(1).
http://dx.doi.org/10.1103/PhysRevE.81.016318---------- CHICAGO ----------
Lee, E., Brachet, M.E., Pouquet, A., Mininni, P.D., Rosenberg, D.
"Lack of universality in decaying magnetohydrodynamic turbulence"
. Physical Review E - Statistical, Nonlinear, and Soft Matter Physics 81, no. 1
(2010).
http://dx.doi.org/10.1103/PhysRevE.81.016318---------- MLA ----------
Lee, E., Brachet, M.E., Pouquet, A., Mininni, P.D., Rosenberg, D.
"Lack of universality in decaying magnetohydrodynamic turbulence"
. Physical Review E - Statistical, Nonlinear, and Soft Matter Physics, vol. 81, no. 1, 2010.
http://dx.doi.org/10.1103/PhysRevE.81.016318---------- VANCOUVER ----------
Lee, E., Brachet, M.E., Pouquet, A., Mininni, P.D., Rosenberg, D. Lack of universality in decaying magnetohydrodynamic turbulence. Phys. Rev. E Stat. Nonlinear Soft Matter Phys. 2010;81(1).
http://dx.doi.org/10.1103/PhysRevE.81.016318